TY - GEN
T1 - Constitutive behaviour of copper ribbons used in solar cell assembly processes
AU - Wiese, Steffen
AU - Meier, Rico
AU - Kraemer, Frank
AU - Bagdahn, Joerg
PY - 2009/7/21
Y1 - 2009/7/21
N2 - One of the driving factors for a steady reduction in wafer and cell thickness is the present shortage of polysilicon feedstock combined with the need to reduce manufacturing costs in photovoltaic module production. Therefore materials and manufacturing processes must adapt to maintain acceptable mechanical yields and module reliability. The soldering of solar cell strings is a critical step in the production of photovoltaic modules. Mechanical load and temperature induced stresses can cause cracking in the cells. During the soldering operation, the cell and the wires heat up and expand and then later contract when the heat is removed below the melting point of the solder. The differential contraction between the Cu and the Si combined with thermal gradients, cause stress to build up in the system. Since the solder thickness (5 ̇̇̇ 20 μm) is relatively small compared to thickness of the copper ribbon (100 ̇̇̇ 200 μm) and the thickness of the silicon solar cell (160 ̇̇̇ 200 μm), the constitutive behaviour of the copper ribbons is one of the key factors to reduce breakage after soldering of solar cells into strings.
AB - One of the driving factors for a steady reduction in wafer and cell thickness is the present shortage of polysilicon feedstock combined with the need to reduce manufacturing costs in photovoltaic module production. Therefore materials and manufacturing processes must adapt to maintain acceptable mechanical yields and module reliability. The soldering of solar cell strings is a critical step in the production of photovoltaic modules. Mechanical load and temperature induced stresses can cause cracking in the cells. During the soldering operation, the cell and the wires heat up and expand and then later contract when the heat is removed below the melting point of the solder. The differential contraction between the Cu and the Si combined with thermal gradients, cause stress to build up in the system. Since the solder thickness (5 ̇̇̇ 20 μm) is relatively small compared to thickness of the copper ribbon (100 ̇̇̇ 200 μm) and the thickness of the silicon solar cell (160 ̇̇̇ 200 μm), the constitutive behaviour of the copper ribbons is one of the key factors to reduce breakage after soldering of solar cells into strings.
UR - http://www.scopus.com/inward/record.url?scp=67650548161&partnerID=8YFLogxK
UR - http://www.scopus.com/inward/citedby.url?scp=67650548161&partnerID=8YFLogxK
U2 - 10.1109/ESIME.2009.4938464
DO - 10.1109/ESIME.2009.4938464
M3 - Conference contribution
AN - SCOPUS:67650548161
SN - 9781424441617
T3 - 2009 10th International Conference on Thermal, Mechanical and Multi-Physics Simulation and Experiments in Microelectronics and Microsystems, EuroSimE 2009
BT - 2009 10th International Conference on Thermal, Mechanical and Multi-Physics Simulation and Experiments in Microelectronics and Microsystems, EuroSimE 2009
T2 - 2009 10th International Conference on Thermal, Mechanical and Multi-Physics Simulation and Experiments in Microelectronics and Microsystems, EuroSimE 2009
Y2 - 26 April 2009 through 29 April 2009
ER -